Re: Gm Zz 572
 

No worries......It was worth a shot.

Re: Gm Zz 572
 

The new ZZ572/620 is built around an all-new Gen VI tall deck Bow Tie cylinder block. This all new race block is filled with a forged 4340 steel crankshaft with 4.375” stroke, shot peened forged 4340 H-beam rods, and forged aluminum pistons with full floating wrist pins. Plasma-moly rings are standard as is the screened and louvered windage tray. Hard core parts for hard core long term durability.
The redesigned rectangular port aluminum cylinder heads result in a pump gas friendly 9.6:1 compression ratio. A hydraulic roller cam with 0.632 inch lift actuates the stainless steel valves. And, of course, hardened chromemoly retainers, roller rocker arms, and dual valve springs are used to complete the valvetrain.
A new GM tall deck single plane intake manifold and 850 CFM Demon carburetor deliver enough air and fuel to make the 620 horsepower at 5,500 RPM and 650 ft. lbs. of torque at 4,500 RPM. Ignition is handled by a GM HEI distributor.
This impressive big-block engine is pump gas friendly, massive torque and horsepower, all from GM, the ZZ572/620 is for who consider excess to be barely enough and suitable for street/strip applications.
Finally released by GM but gone is the bright red paint and Chevy Bow Tie logo on the valve covers. In are traditional Chevy orange paint and 572 on the valve covers.
12499190 Partial Engine (Short-Block) 12498792 Base Engine (Long-Block) 12498793 Premium Engine
572 C.I.D. - 9.6:1 Compression Crate Engine Technical Information
Horsepower 620 @ 5500 RPM
Torque 650 Ft. Lbs. @ 4500 RPM
Max. Recommended RPM 6000 RPM
Compression Ratio 9.6:1
Bore 4.560”
Stroke 4.375”
Ignition Timing 36° total advance
Fuel 92 Octane
12499190 Short-Block Components
Rear Main Seal New! One-piece design
Block 25534368 - Sportsman Tall Deck Bow Tie Gen VI, 10.200” Deck Height
Crankshaft 88961554 - Forged 4340 steel
Connecting Rods 88962926 - Forged 4340 steel, H-beam style, Shot peened
Pistons 88962925 - Forged Aluminum, Full Floating Wrist Pin
Piston Rings 12499212 - STD size premium plasma-moly
Main Bearings 88962212 - STD size premium main bearing kit.
Rod Bearings 88961556 - STD size premium rod bering kit.
Cam Bearings 12499434 - STD size premium cam bering kit.
12498792 Long-Block Components (Short-Block Components Plus The Following:)
Camshaft 88961557 - Hydraulic Roller (Valve lift: .632” I, .632” E; Duration @ .050” 254° I, 264° E)
Lifters 17120060 - Hydraulic Roller Tappet
Cylinder Heads 12499255 - Aluminum rectangular port, 118cc combustion chamber
Head Gaskets 88961561
Intake Valves 12366987 - 2.25” Stainless steel
Exhaust Valves 88963128 - 1.88” Stainless steel
Valve Springs 88963934 - Dual valve springs, 1.564” coil dia., 1.800” installed height, 197 Lbs. seat pressure
Valve Spring Retainers 12366990 - Hardened chrome moly steel
Valve Retainer Key 12366992
Rocker Arms
12361323 - Aluminum roller rockers, 1.7:1 ratio
Push Rods Intake 88961559 - High performance one piece
Push Rods Exhaust 88961558 - High performance one piece
Valve Covers 12499200 - Special 572, Orange Powder Coat
Damper 88962814 - High RPM torsional damper SFI approved, 8”.
Oil Pan 88963707
Windage Tray New! Screened and louvered
Oil Pan Gasket 10106407
Oil Pump 88963707
Spark Plug 05613878 - R45XLS
12498827 Premium Engine (Long-Block Components Plus The Following:)
Intake Manifold 88961161 - Aluminum tall deck single plane, 4150 series carburetor.
Carburetor 88961560 - 850 cfm Demon, mechanical secondary
Distributor 88961867 - HEI
Water Pump 14058915 - Aluminum, Short Style
Flex Plate 12561217 - Special 572, Automatic Transmission
Intake Gasket 88962213 - Gasket, Intake Manifold
Spark Plug Wires 12499211 - Red
Plug Wire Looms 12495502 - Black Wire Loom Kit

Re: Gm Zz 572
 

thanks bpine, where'd ya get that?

Re: Gm Zz 572
 

A Cam change for sure...valves and springs too, not to mention fatting up the mains a bit, MSD dist. too, and I would think it will work at 5200rpm for a while.

bpine, great info but you missed this...$12,995.00

Re: Gm Zz 572
 

This was a little piece of info from a post RAYLAR did a month or so ago.

Thought I would chime in with some facts. The ZZ572 crate engines are a GM High Performance creation. The engine is machined and assembled outside of Detroit by a company called P.A.S. whcih is a joint venture by Rousch Industries and the Unibore Company. The blocks are tall deck Merlin castings. The pistons are forged J&E, the rods and Cranks come from Callies and the heads are by Edelbrock.

The rest of the post was not to kind to the motor being used in a boat.

Re: Gm Zz 572
 

Any one know who Unibore Co is?
When I bought a GM pro stock block, included in the paper work was a sonic test and clearance sheet from Unibore.
As far as the 572 motor goes... I would invest in a gasket set and pull that puppy apart and double check everything!!! But for the money and with those quality parts it seems like a pretty good deal.
The pro stock block is advertised by GM as being cnc machined and ready to assemble. Not quite true. I suppose I could have run it, but after inspection decks were out .005 corner to corner so I decked it to put the pistons .005 in the hole and I decided to line hone prior to boring just to make sure everything was square and straight and be able to use std bearings. But I guess I may be over anal.

Re: Gm Zz 572
 

Re: Gm Zz 572
 

Hot Rod Magazine had a pretty decent article on those motors, think it was August issue.

Re: Gm Zz 572
 

Wish I had pulled mine down from new and checked clearances etc.
Had problems with oil pressure from start.
Very bouncy timing mark also ? maybe from oil pump.
Raced it last weekend, 1st time since taking it out of crate, and now have sump full of metal :mad:
GM ZZ 572 720 HP

Re: Gm Zz 572
 

run a search on here, Jeffrey cheng put the 572's in his gladiator and it seemed to do fine, almost 100 right out the box, he did change valves and "marinized" it.